Founder stories
Founders whosold first.
Four teams, four long interviews. What they believed before Founder Sprint, what broke, and what the numbers look like now. Every number is as stated by the founder.
FS1, May 2025From a vitamin to a painkiller.
Serverkit came to the first Founder Sprint with strong technology and no clear customer. It came out selling to enterprises instead of developers. Today the company, now BeSir, has reached $1M in ARR, with customers including POSCO DX and KMG.
Ted (Taehoon) Kim, CEORead the story 
FS3, Sep 2025Charge a premium.
in10s Lab had recurring revenue in Korea, but at ₩500K to ₩700K per customer it could not keep a team of five or six alive. After Founder Sprint 3 it sells contracts of about ₩10M each, as infrastructure for Korean teams going global.
Jessy (Jiyoung) Yoon, CEORead the story Get paid before the MVP.
Clavie came to Founder Sprint 2 with a habit app for US users: about 2,000 users and zero revenue. Four weeks later it had pivoted to creators, closed a paid PoC of about ₩7M without a finished MVP, and opened talks with Geekble, a creator with over a million subscribers.
Youngheon (Young) Jung, CEORead the story 
FS1, May 2025Hustle like a YC team.
ORBT came to the first Founder Sprint building a consumer app on its own assumptions. In four weeks it pivoted from B2C to B2B, then earned its first pilot revenue and raised its first investment from Mashup Ventures.
Joshua (Minsu) Kim, Founder and CEORead the story 
FS2, Jul 2025Move first, refine as you go.
NECTON came to Founder Sprint 2 with technology, an idea and a vague plan for the US. Customer interviews turned email data extraction into document structuring for AI, and a clearer business model led to a funding round.
Hyunji Park, CEORead the story Your story next.
Every team above started with a product and an assumption. Four weeks later they had a paying customer or a reason to change course. Round 1 closes October 30.
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